hosbeih



a'entod July 8. 1919.

3 SHEETSSHEET I.

L. H. HOSBEIN.

FURNACE ARCH cowsmucmw.

APPLICATION FILED APR. 4. 1917.

i.a H. HOSBEIN.

FURNACE ARCH CONSTRUCTION.

APPLICATION HLED APR.4, 1917- l Y lawmed July 8, H519.

3 SHEETSSHEET 2.

i.. H. HSBEIN.

FURNACE ARCH CONSTRUCTION.

MFLICATxor-1y man Ama. 1911-.

sentation-anon oonsrnnorron. A

To all whom t may concern-z ,Be it known that I, Louis H. Hossain, a citizen of the United States, and resident of` Chicago, in the county of @ook and State of illinois, have invented certain new and useful improvements in Furnace-rtrchv Constructions, of which the following is a specification.

y y'This invention relates to arch. constructions for furnaces equipped with traveling grate. stokers, having reference, more particularly, to ignition arches which overhang the grate throughout the width of the conil 'bustion chamber and forwardly of the main or furnace arch; Such ignition arches being adjacent the fuei delivery 4end of the furnace absorbs a large amount of heat both by'contact with the products of combustion from the fresh fuel and by radiation from -tlie fuel bed, and, therefore, thev fire bricks of an ignition arch burn out `more quickly than the bricks of the rearwardl or furnace arch. y

An object of my invention is to provide, in a furnace of the character mentioned, an

ignition arch of such construction that the fire bricks or blocks thereof present a series ofradiating surfaces whereof those at the forwardv portion of the arch are protected to a large extent from the destructive action of the intense heat, and that such bricks, or any of them, can be readily removed and replaced by others, as occasion may require.

Another object of my invention is to provide an arch of such construction that an intimate mixture of the gases. arising from the burning fuel is zedected, thereby insuring better combustion,

Ajfurther object` of my invention is the provision of an arch of such construction` that, a relatively narrow delivery throat from the fuel hopper to the combustion chamber is provided, andthat the use of protecting tile on the stoker gate is avoided.

A still further object of my invention isV to provide arch-work of such charactervthat arches or arch sections on diderent levels can be effectuaily'connected., With these and other objects in view my invention comprises, in a traveiing grate Stoker furnace, `an ignition archlwhereof the bricks are arranged in step formation as' Specinpation oi Letters Patent.

raten-tea ,nay s, raie,

.application aie@ anni fil, ieiv. semi no. 15eme.

cending from 'a point adjacent the front of the grate in such a manner that a series of anguiar heat-radiating surfaces are exposed ,to thedirect action of the heat from the burning fuel. Y i

The invention also comprises an arc-ii embodying step-like suspension members by means of which the Iirebricks are so arranged and supported independently 0f each other thata brick'or series of bricks vcan be readily removed and another brick lor bricks as readily substituted therefor.

Figure is a iongitudinal vertical section through a portion of a traveling grate Stoker furnace embodying the preferred form of my invention. p

, Fig. la is a partial transverse section, as on the line 1.-.-1 of Fig.. i.'4

F ig. 2 is a section similar to-'Figl showing a modification of the ignition arch.

Fig. 3 is a partiai plan of the structure illustrated in Fig. l, the covering and other parts of the furnace above the supporting beams being omitted in order to expose the arches'and their suspension elements.

Fig. e is a perspective view showin@ the step suspension structure for-the' bricks of the ignition arch, apart of the supporting beam being shown.

Figs,Y 5, 6,' 7 and 8 are similar views of y Fig. 9 is a' perspective view of a form of hanger for the arch-bars of the rear or furnace arch, showing a portion of an arch bar and-aise a portion of the beam from l which said. bar is suspended. Y

Referring to the drawings, l0 designates the side walls of a furnace; il the front wall, and l2 the top. i' i3 designates the fuel hopper located eX- lteriorly of the front wall', and ie an endless traveiing chain grate to which the fuel is supplied from the hopper'and thus carried bythe grate into'the combustion chamber 'in the usuai manner The main or furnace arch, which is located above the chain grate, is of the general flat type. In the present instance said main or furnace arch comprises rows of dre bricks carried by a series of spaced parallel arch bai 16 which extend longitudinally of the furnace, said bars being suspended by' hangers from spaced girders 17 .and 18 which extend transversely of the furnace from side to slide thereof. Each of the arch bars includes a vertical web 'having lateral flanges along its lower edge. The bricks 15 are provided in their upper surfaces with undercut l grooves 15 whereby such bricks may be individually slid upon the lateral flanges of an larch bar 16 and thus be detachably supported side by side throughout the length of the bar. The brick 19 at the rearward yend Lof-each of the arch bars is provided with a rearward extension having a'recessed top portion 20 with which engages the overhanging nose'21 of an end brick 22. The

latter brick is thus supported in` close con-` tact with the outer end of the arch bar so as tocover and protect such end. This end brick'arrangement is substantially the same as -that described in Letters Patent of the United States No. 1,259,215, dated Marchy 12, 1918. The arch bars 16 are slightly inclined upwardly from the front to the rear of the combustion chamber, and hence the brick-work carried by the bars is correspondingly inclinedL The rear girder in its preferred construction includes a pair of spaced parallel chani nel bars extending from side to side of the furnace. Depending between these bars is a hanger comprising a rod. 23 having at its .fupper end a cross-piece 24 which rests upon the tops of the bars; the lower end of the rod being pivotallyconnected to the web of the adjacent arch bar. This girder and suspension construction is substantially such as described in Letters Patent of the United States No. 1,284,066, dated November 5,1918. The forward and intermediate girders 17 comprise single I-beams extending from side to side of the furnace. e preferred form of arch bar'hang'er which I employ in connection'with the beams 17 includes-al clipvlike structure comprising a body 25 having at one end .an inwardly overhanging lip 26 and at the other end an upstanding lug 27, whereby the body may be readily applied to the underside of a Ibeam in such manner 0f the adjacentarch bar, the weight of vthe combustion chamber.

that the lip overhangsY one of the beamy Lacasse l applied to or removed from the beam at any point in the length of the latter; thus facilitating the operation of installing or repairing the arch section.

tion to each other throughout the width of j rlhese structures are suspended by suitable hangers depend ing from an -beani 30 which is supported at vits ends on the side walls of the furnace. The bricks are so disposed as to incline upward to and merge with the main or furnace arch from a level beneath the front wall of the furnace and adjacent the front of the grate. Each structure comprises a web 31E having along its lower edge a series of laterallyk projecting flanges 32 which are spaced apart and arranged in ascending step formation from the forward to theu rearward end of the web. 1n the construction illustratedr in Figs. 1 and 1, three step anges are arranged on each side of the web, such flanges being adapted to engage the grooved portions of appropriately-formed fire bricks and thus support the succeeding bricks in close relation to each other, as will be presently described. rl'he preferred form of hanger for each of the step `struct-rires comprises a body 33 having on its upper surface spaced under-cutr webs 34 which provide hook portions adapted to be slid upon the lower Hanges of the -beam 30 as best seen in Fig. 4, whereby the said body can be readily movable and adjustable longitudinally of the beam. Depending from the outer ends of the body` 33 are two rods `35 of dii'erent lengths to the lower ends of which the web of the step-structure is pivotally connected, as indicated at- 36. rl`he lower end of the inclined web 31 comprises a horizontal portion 37 which/extends into the usual fuel opening in the front wall of the furnace, so as to lie in close relation to the stoker gate 38, while the upper end of the'web terminates short of the forward end of the main or furnace arch. (See Fig. 1.) The flanges 32 at the lower end of the web are of sufcient length to receive and support twb nsoaeee groove being undercut as at 43 so that when the brick 4() is applied to the inner end portion of the flanges 32 it incases and protects such portion, and also takes against and lies under the adjacent angular edges of the web so as to cover and protect such edges, as seen in Fig. 1. The brick on the second pair of step flanges 3 2 is similar in construction to th'e brick 4() just described, and it likewise protects the flanges and. the adjacent edges of the web from the direct action of the heat from the burning fuel. The brick 44 which is supported on the uppermost flanges 32 is provided with a recess or depression 45 in its upper surface just beyond the supporting member, and a brick 46 provided with anf overhanging nose 47 (similarly to the brick 22) is entered in the recess andl thereby suspended snugly in the space between the brick 44 and the front end brick 15 of the main or furnace arch. rlhe brick 46 serves as a key to keep in place the adjacent rows of bricks of the two arches. rl`his key brick, as it may be termed,v

is preferably arranged in step relation tothe adjacent brick 44, as seen in F ig. 1. rl`he key brick can be readily applied to or removed from the brick 44 so as to close or open the vspace between the adjacent end bricks of the two arches. When the key brick is removed the resulting space permits the ready removal of the bricks from the stepmember and the substitution of others therefor. Such space also permits a similar removal of bricks' from the arch bar 16 and their replacement by others, as occasion may re uire.

y the construction described it is to be noted 'that a succession of stepped heat-radiating surfaces is provided in the ignition arch in such relation to the fresh bed of fuel that a Iwhirling and a thorough mixture of the ascending gases .are effected, thus prol moting their combustion; that a relatively small portion of the'rearward surface of each brick vis subjected to the destructive action of the heat, thus conservingthe life of the arch; that the front row or rows of bricks extend adjacent to and parallel with the grate so as to adord a relatively narrow fuelinlet throat and thus insure the delivery.

Vcfa uniform depth of fuel from the ho per side to side of the furnace and from the lower row of bricks to the elevated furnace arch is provided. Furthermore that the ignition arch is structurally independent of the furnace arch, and therefore either* arch may be installed, removed, or repaired without disturbing or impairing the other.

ln the modification illustrated in Fig. 2

the stepped supporting structure is represented as provided .on each side with four ascending step flanges 32 having fire-brick mounted thereon, and the key-brick 46 is represented as bearing against a brick47 at the forward end of the furnace arch; such latter brick being supported in step relation to the brick 46Y by a flanged bracket 48 which is applied to the corresponding end of the suspended arch bar 16. rlhus when the key-brick is removed, the brick 47 and its bracket, together with the remaining bricks on the arch bar, may be detached and replaced if desired. So also the bricks on the step-member of the ignition arch may be removed and replaced if required.y

l do not limit myself to the structural details herein set forth, as the construction' the flanges of the latter members and positioned to present heat-radiating surfaces ascending inv step-like formation Atoward but short of the main arch, and removable keybricks located between the adjacent spaced ends of the main and ignition arches and locking the fire bricks on the flanged members of the respective arches. l

2. A furnace having a traveling grate and an arch construction overhanging the grate and extending from side to side of the -furnace, said construction comprising a main arch and an ignition arch, the main arch including longitudinally flanged members extending lengthwise of the furnaceand fire bricks slidingly mounted upon the. flanges. of said members, and the ignition arch includ-` ing longitudinally flanged suspension members extending lengthwise ofthe furnace and fire bricks slidingly mounted upon the danges of the 'latter members and positioned to,V present lheat-radiating surfaces ascending in step-like formation toward'but short of the main arch, and4 removable key-bricks loflanges thereon ascending in step-like -formation toward the rearward arch from a level adjacent the-front o r fuel receiving portion of the grate, and fire bricks carried by said flanges."

4. A furnace having a traveling'grate and arch construction overhanging the grate, said construction comprising forward and rearward arches whereof the forward arch comprises a series of members having spaced flanges thereon ascending in step-like forma tion toward the rearward arch from a level adjacent the front or fuel receiving portion of the grate, a beam overhanging said members, means suspending said members from the beam, and iirebricks carried by said iianges.

5. A furnace having a front wall with a fuel opening therein, a traveling grate eX- tending from said opening into the combus- 6. Afurnace having a traveling grate and arch construction overhanging the grate, said construction comprising forward and rearward arches whereof the forward arch includes a series of members having spaced 'flanges thereon ascending in step-like formation toward the rearward arch from a level adjacent the front or fuel receiving portion ofthe grate, and fire bricks having recessed upper portions which embrace the flanges and protect the same and the parts of the members between successive flanges.

7. A furnace having a front wall with a fuel opening therein, a traveling grate eX-vl imember having laterally-projecting flanges arranged in ascending step-like formation,`

tending from said opening into the combustion chamber, and arch construction overhanging the grate, said construction comprising forward and rearward arches whereofthe forward arch includes a' series of members having spaced flanges thereon ascending in step-like formation from a level within the fuel opening and adjacent the grate, a rowof fire bricks recessed to embrace the lowermost anges within the incense opening, and other re bricks. having upper portions recessed to embrace'the flanges and protect the same and' the parts of the membersbetween successive flanges.

y8. A furnace lia-ving a traveling grate and arch construction overhanging the grate, said construction comprising forward and rearward arches whereof the forward arch includes a series of members having spaced flanges thereon ascending in step-like formation from a level adjacent the grate toward but short of the forward end of said rearward arch, hre-bricks having their upper portions longitudinally recessed and slidably mounted on said flanges, and removable key-bricks in the space between the said members and the rearward arch.

9. A furnace having a traveling grate andy yarch construction overhanging the grate,

said construction comprising forward and rearward arches, whereof the rearward arch includes a series of longitudinally flanged arch bars extending lengthwise ofthe furnace anda row of recessed lire bricks slidably mounted upon the flanges of each of. said bars, and whereof the lforward arch includes a series of suspension members hav ing brick-supporting portions ascending from a level adjacent the grate toward but short of the forward end of said rearward arch, fire bricks carried by said members, and removable {key-bricks in the space be-` tween the said membersand' the rearward arch: A

l0, A furnace having a traveling grate and arch construction overhanging the grate, said construction comprising forward and rearward arches whereof the rearward arch includes laseries of longitudinallv anged arch barsextending lengthwise of the' furnace and a row of recessed fire bricks slidably mounted upon the anges of each of said bars, and whereof the forward arch includes a series of members having lspaced.

flanges thereon ascending in step-like form-ation from a level adjacent the grate toward but terminatingshort of the forward end of said rearward arch, recessed lire bricks slidably Imounted on said flanges; and removable key-bricks in the space between the said members and the rearward arch.

' il. An arch brick support including a member having laterally-projecting flanges arranged in ascending step-like formation. l2. An arch brick support including a and suspension means for said member.

18. An arch brick support including a member having laterally-projecting flanges arranged in ascending step-like formation, a clip element having a beam-engaging por-'- tion and means depending from said element connected to said member.,

le. ln a furnace, an arch comprising a series of counterpart brick supporting memsaid bricks having undercut recesses with bers, means suspending said members in which the said hlnges are engaged.

spaced `parallel relation to each other, and Signed at Chica` o in the county of Cook 10 rows of lire-bricks carried by the respective and State of Illinols this 20th day of March members, each of said members consisting of A. D. 1917.

a. web having a. series of laterally-projecting flanges in ascending step-like formation, LOUS H. HSBEIN. 

